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A laboratory-based beam tracking x-ray imaging method achieving two-dimensional phase sensitivity and isotropic

G Lioliou1, C Navarrete-León2, A Astolfo2

  • 1Department of Medical Physics and Biomedical Engineering, University College London, Malet Place, London, WC1E 6BT, UK. g.lioliou@ucl.ac.uk.

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Summary

This study introduces a novel mask design for beam tracking X-ray Phase Contrast Imaging. It enables high-resolution 2D imaging with single-direction scanning, significantly reducing scan times.

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Area of Science:

  • Medical Imaging
  • Physics
  • Materials Science

Background:

  • X-ray Phase Contrast Imaging (XPCi) offers enhanced sensitivity for material and biological imaging.
  • Current beam tracking XPCi methods, like Shack-Hartmann, require multi-directional scanning for 2D resolution, increasing acquisition time.
  • Achieving high spatial resolution is limited by mask aperture size and dithering precision.

Purpose of the Study:

  • To develop an improved mask design for beam tracking XPCi.
  • To enable two-dimensional phase sensitivity and isotropic resolution with reduced scanning requirements.
  • To demonstrate the efficacy of the new mask design in imaging phantoms and biological samples.

Main Methods:

  • A novel mask design using offset rows of circular apertures was developed.
  • This design facilitates two-dimensional phase sensitivity and isotropic resolution.
  • The method was tested using custom-built phantoms and biological specimens.

Main Results:

  • The new mask design allows for single-direction sample or mask stepping.
  • Quantitative phase retrieval was successfully achieved.
  • Near aperture-limited spatial resolutions were obtained in two orthogonal directions.

Conclusions:

  • The proposed mask design significantly optimizes beam tracking XPCi by reducing scan time.
  • It achieves high-resolution 2D phase imaging with isotropic resolution.
  • This advancement holds potential for improved diagnostic capabilities in medical and materials science applications.